In the first half of the nineteenth century it was generally believed that reactions of organic compounds proceeded with minimal structural change. This tenet simplified the elucidation of the numerous substitution, addition and elimination reactions that characterized the behavior of common functional groups.
In the 1970s the solderless breadboard (AKA plugboard, a terminal array board) became available and nowadays the term breadboard is commonly used to refer to these.Breadboard is also a synonym for  prototype .Because the solderless breadboard does not require soldering, it is reusable. This makes it easy to use for creating temporary prototypes and experimenting with circuit design.n the 1970s the solderless breadboard (AKA plugboard, a terminal array board) became available and nowadays the term breadboard is commonly used to refer to these.
Sometimes small PCB adapters called breakout adapters can be used to fit the component to the board. Such adapters carry one or more components and have 0.1 in (2.54 mm) spaced male connector pins in a single in-line or dual in-line layout, for insertion into a solderless breadboard.